Use the correct form of adjective in the given sentence:
"This is the ________ point on this mountain range".

The correct answer is Option D (Farthest).

Key Points:
• Degrees of Comparison of Adjectives: 'Far' has two sets of comparative and superlative forms:
• Physical distance: Far → Farther → Farthest.
• Degree/extent/additional: Far → Further → Furthest.
• The sentence refers to physical geographic distance on a mountain range ('point on this mountain range') preceded by the definite article 'the', requiring a superlative degree adjective.
• Since physical distance is meant, 'farthest' is the standard and precise choice.
• Key Takeaway: 'Farthest' denotes the most distant point in physical space, preceded by 'the'.